OIL-IMMERSED TRANSFORMER THERMAL MONITORING AND PREDICTION SYSTEM

摘要

A real time thermal monitoring and prediction system (TMPS) is provided for use in monitoring and operating a transformer. The TMPS may be used to estimate a maximum loading level for the transformer over a future time period using a dynamic thermal model for the transformer and ambient temperature forecasts. The transformer may be loaded to its maximum loading level during power congestion or a service restoration process.

主权项

1. A method of monitoring and operating an oil-filled transformer having a winding, the method comprising:
(a.) receiving a forecast period; (b.) receiving a value of current in the winding; (c.) receiving a value of ambient temperature; (d.) calculating initial values for a top-oil temperature and a winding hot-spot temperature of the transformer using the received values of current in the winding and ambient temperature; (e.) setting a simulation current for the winding of the transformer to a maximum value; (f.) receiving a forecast of future ambient temperatures for the forecast period; (g.) starting with the initial values for the top-oil temperature and the winding hot-spot temperature, recursively calculating updated values for the top-oil temperature and the winding hot-spot temperature of the transformer for a simulation time using the simulation current and the forecast of future ambient temperatures, the simulation time being the lesser of the forecast period and the time at which the calculated updated value of the top-oil temperature exceeds a maximum top-oil temperature or the calculated updated value of the winding hot-spot temperature exceeds a maximum winding hot-spot temperature; (h.) recording the simulation time and the simulation current; (i.) decrementing the simulation current; (j.) repeating steps (g.) through (i.) until the simulation current is a minimum value; (k.) using the recorded simulation currents and the recorded simulation times to create a loadability function for determining a maximum permissible loading level at any given time during the forecast period; and (l.) using the loadability function to operate the transformer during the forecast period.